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<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a view:<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">create view mb_field_view AS<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">SELECT<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> m.app_id AS app_id, m.basket_id AS basket_id, x.item_id AS field_id,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> p.available AS available, p.label_main AS label_main, p.title AS title,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> p.orda AS orda, x.filter_id<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> ,m.res_ins_id -- add this<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">FROM basket_main m<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> JOIN basket_item x ON m.basket_id = x.basket_id<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> JOIN field_precis p ON x.item_id = p.field_id<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">WHERE x.item_type = 1<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:4.5pt"><span style="font-family:"Courier New"">AND x.status = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:4.5pt"><o:p> </o:p></p>
<p class="MsoNormal">So pretty clearly stats on basket_item columns item_type and status look like a good idea. Even more so as the data is heavily skewed with these two conditions accounting for 99% of the table.<o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">*** statistics for database bowtest version: S0001<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">*** <span style="background:yellow;mso-highlight:yellow">
table basket_item rows:1637249</span> pages:25609 overflow pages:0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">*** column status of type integer (length:1, scale:0, not_nullable)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">date:2018_06_08 13:31:08 GMT unique values:1.000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">repetition factor:1637249.000000 unique flag:N complete flag:0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">domain:0 histogram cells:2 null count:0.000000 value length:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">cell: 0 count:0.000000 repf:0.000000 value: -1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";background:yellow;mso-highlight:yellow">cell: 1 count:1.000000 repf:1637249.000000 value: 0</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">*** statistics for database bowtest version: S0001<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">*** table basket_item rows:1637249 pages:25609 overflow pages:0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">*** column item_type of type integer (length:1, scale:0, not_nullable)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">date:2018_06_08 13:11:35 GMT unique values:3.000<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">repetition factor:545749.6875000 unique flag:N complete flag:0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">domain:0 histogram cells:4 null count:0.000000 value length:1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">cell: 0 count:0.000000 repf:0.000000 value: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";background:yellow;mso-highlight:yellow">cell: 1 count:0.999519 repf:1636462.000000 value: 1</span><span style="font-family:"Courier New""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">cell: 2 count:0.000464 repf:760.000000 value: 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">cell: 3 count:0.000016 repf:27.000000 value: 3<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So when I run a query:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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